JP3137448B2 - Construction method of concrete main tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a concrete main tower, and more particularly to a method for constructing a concrete main tower capable of constructing a concrete main tower having high working efficiency and excellent appearance.

[0002]

2. Description of the Related Art Conventionally, concrete towers have been used for bridges such as roads, railways, and waterworks.

[0003] In such a concrete main tower, an inner frame and an outer frame are installed using a wooden or steel plate, and a reinforcing bar is disposed between the inner frame and the outer frame. It was built by casting.

[0004]

However, in the case of constructing a long concrete main tower by the above-mentioned conventional method, it is necessary to construct the inner frame and the outer frame and to arrange the reinforcing bars at a high place. Becomes Therefore, there is a problem that unstable work at a high place is increased, and the work is not only dangerous but also difficult to speed up the work.

When a wooden or steel plate is used as the outer frame, the outer frame needs to be removed after the cast concrete has solidified, which increases the number of work steps. There was also a problem.

Further, in the above-mentioned method, since the cast concrete forms the outer surface of the concrete main tower as it is, there is a problem that it is difficult to construct a concrete main tower having an excellent appearance. .

The present invention has been made to solve the above-mentioned problems, and provides a method of constructing a concrete main tower capable of constructing a concrete main tower having high working efficiency and excellent appearance. The purpose is to provide.

[0008]

In order to achieve the above object, a method for constructing a concrete main tower according to the present invention comprises the steps of: casting concrete in a formwork to construct a foundation; Forming a formwork with a precast concrete panel above, placing a reinforcing bar in the formwork, then casting concrete to build an intermediate portion, and a precast concrete in which a reinforcing bar is buried above the intermediate portion. Forming a form with a panel, casting concrete into the form, and constructing a top.

[0009]

In the method for constructing a concrete main tower according to the present invention, a precast concrete panel is used as a form body in the construction of an intermediate portion and a top portion which require work at a high place. Then, the precast concrete panel is integrated with the cast concrete to constitute the concrete main tower as it is, and the work of removing the formwork as in the conventional construction method becomes unnecessary. Moreover, in particular, since the formwork is formed by using the precast concrete panel in which the reinforcing bar is buried at the top, which is the uppermost portion of the concrete main tower, it is not necessary to perform the reinforcing bar arranging operation. Therefore, labor at high places can be saved.

Further, in the concrete main tower constructed according to the present invention, since the precast concrete block forms the outer wall of the main tower, it is possible to construct a concrete main tower having a beautiful appearance.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, for convenience of description, a concrete main tower 10 installed by the method for building a concrete main tower according to the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1 and FIG. 2, a concrete main tower 10 comprises a main tower section 11 and a horizontal beam section 12 connecting the left and right main tower sections 11 and 11. Main tower 11
Is formed in a hexahedral shape in which the cross-sectional area gradually decreases toward the upper side in the vertical direction. The main tower portion 11 includes a base portion 11a constituting a lowermost portion of the main tower portion 11, and a base portion 11a.
The upper part a comprises an intermediate part 11b above the intermediate part 11a, and a top part constituting the uppermost part of the main tower 11 above the intermediate part 11b.

The cross beam 12 is a member made of concrete extending in the horizontal direction, and connects the pair of main towers 11 with each other. The four cross beams 12 are provided horizontally between the main towers 11, 11.

Hereinafter, a method of constructing a concrete main tower according to the present invention will be described with reference to FIGS. The method for constructing a concrete main tower according to the present invention includes the main tower 11
And a step of constructing the cross beam portion 12 so as to bridge between the main tower portions 11 and 11.

First, a method for constructing the main tower 11 will be described. [1] Construction of Main Tower Section Construction of Base Section 11a Construction of the main tower section 11 is started by constructing the base section 11a. Since the base portion 11a is a portion to which the largest stress is applied including the engagement with the footing, a reinforcing bar is arranged, a steel form is constructed so as to surround the reinforcing bar, and the steel form is placed in the steel form. It is built by casting concrete. Construction of the intermediate part 11b After the foundation part 11a has been constructed by the method described above, the intermediate part 1b is constructed.
Construction of 1b is performed. As shown in FIG. 3, the intermediate portion 11 b is constructed by a process of constructing an outer frame 22 so as to surround the hydraulic lift 20 and an inner frame 24 inside the outer frame 22. And a step of placing concrete 26 in the space defined by the outer frame 22 and the inner frame 24.

As shown in FIG. 3, the hydraulic lift 20 is provided with a work platform 28 which can be moved up and down by a hydraulic system. The work platform 28 can transport materials and secure a work floor. Become.

A panel assembling robot 30 is provided on the work stand 28. The panel assembling robot 30 can assemble precast concrete panels constituting the outer frame 22 and the inner frame 24. It is configured. A panel lifting winch 31 is provided on the top surface of the work stand 28, and the precast concrete panel is lifted and moved by the panel lifting winch 31 so that the outer frame 2 is moved.
2 and the inner frame 24 can be constructed.

The outer frame body 22 and the inner frame body 24 are constructed as shown in FIGS.
This is performed by stacking the precast form panels 32 in a vertical direction so as to surround the zero.

This precast form panel 32 is shown in FIG.
As shown in FIG. 1, a concrete panel body 34 made of concrete and a steel panel 36 are provided. The steel panel 36 includes a vertical rib 36a formed of angle iron and attached vertically, and a horizontal rib 36b attached horizontally, and the vertical rib 36a and the horizontal rib 36 are provided.
b form a lattice shape orthogonal to each other. Further, the steel panel 36 is provided with a reinforcing bar brace 37 attached in an oblique direction in order to increase the rigidity in the horizontal direction.

The bracing 37 constituting the steel panel 36
One is embedded in a concrete panel main body 34 as shown in FIG. By adopting such a configuration, when the concrete 26 is cast between the outer frame body 22 and the inner frame body 24, the concrete panel main body 34, the steel material panel 36, and the cast concrete are formed. Can be integrated.

The outer frame body 22 and the inner frame body 24 are used to form the precast form panel 32 having the above-described structure, as shown in FIGS.
As shown at 0, it is built by joining vertically and horizontally. The joining in the vertical direction is performed by fastening the lateral ribs 36b, 36b with bolts, as shown in FIG. As shown in FIG. 9, the joining in the horizontal direction is performed by attaching the attachment plates 40, 4 between the horizontal ribs 36b.
It is performed by applying 0 and fastening with bolts.

After the outer frame 22 for one lift is built by the above method, the inner frame 2 is formed in the same manner.
4 is built. The outer frame 22 and the inner frame 2
As shown in FIG. 11, 4 is fixed by a separator 41 at a predetermined interval. This separator is formed by connecting, using a fastening jig 44, screw rods 42, 42 having one ends embedded in precast form panels 32, 32 constituting the outer frame 22 and the inner frame 24, respectively. Such a separator 4
1 to form the cast concrete 26
It is possible to fix the outer frame 22 and the inner frame 24 against the internal pressure caused by the pressure.

The outer frame 22 of one lift (for example, 5 m)
After the installation process of the inner frame body 24 is completed, a casting process of the concrete 26 is performed. This concrete casting
Concrete 26 is cast between the outer frame 22 and the inner frame 24. The casting of the concrete 26 is performed from a concrete pump (not shown) installed at a lower portion of the hydraulic lift 20 via a pipe provided along the hydraulic lift 20.

When the step of constructing the intermediate portion for one lift is completed by the above steps, the outer frame and the inner frame for the next lift are built vertically upward, and the same steps are repeated thereafter. .

As described above, in the method for constructing a concrete main tower according to the present invention, a PC concrete block is used as the outer frame, and the PC concrete block forms the outer surface of the main tower even after the completion of the main tower. So
Unlike the case of using a conventional wooden or steel mold body, the work of removing the mold body is not required, and the construction work can be simplified accordingly.

Further, by using the PC concrete block subjected to aesthetic treatment, it becomes possible to construct a concrete tower having a beautiful appearance. Construction of the top 11c After the intermediate portion 11b has been constructed by the method described above, the top 1
Construction of 1c is performed.

At the top, a step of installing a full precast concrete 50 to determine a corner portion, a step of constructing an outer frame 54 so as to surround the hydraulic lift 20, The method includes a step of constructing the inner frame body 56 and a step of casting the concrete 26 into a space formed by the outer frame body 22 and the inner frame body 24.

The full precast concrete 50 is, as shown in FIG. 12, a solid block formed of concrete. The full precast concrete 50 has a concrete hole 50a for joining to the outer wall 54 and the inner wall 56.

The outer frame 54 and the inner frame 56 are constructed as shown in FIG.
As shown in FIG. 2 and FIG. 13, the half-flexible frame panel 52 is vertically stacked so as to surround the hydraulic lift 20.

The half precast frame panel 52
As shown in FIGS. 12 to 17, a concrete panel main body 58 made of concrete and a vertical reinforcing bar 60 embedded in the concrete panel main body 58 are provided.
And a horizontal reinforcing bar 62.

As shown in FIGS. 13 and 15, a convex portion 52a and a concave portion 52b are continuously formed on the upper edge and the lower edge of the half precast frame panel 52. In addition, as shown in FIG. 14, dents 52c are formed on both sides of the half precast frame panel 52. As shown in FIG. 15, the vertical reinforcing bar 60 has one end protruding from the projection 52a and the other end projecting from the recess 5a.
It is configured to protrude into a sleeve 52d formed in 2b. Further, as shown in FIG. 14, the horizontal reinforcing bar 62 is configured such that both ends thereof protrude outside from the recessed portion 52c.

The outer frame member 54 and the inner frame member 56 are formed by connecting the half precast frame panel 52 having the above-described structure to the structure shown in FIG.
And as shown in FIG. 13, it is built by joining in the vertical direction and the horizontal direction.

As shown in FIGS. 16 and 17, the non-shrink mortar 6 in the sleeve 52d is used for the vertical joining.
4 to join the vertical reinforcing bars 60, 60
A sleeve joint is used. Since the half precast form panel 52 is for joining a vertical reinforcing bar buried in the concrete panel main body 58, it is inevitable that the rigidity is reduced as compared with the above-mentioned precast form frame. Therefore, it is preferable to compensate for the decrease in rigidity by staggering in the vertical direction.

Further, as a joining method in the vertical direction, it is also possible to use a joint of a type having an additional line 66 as shown in FIGS. Further, it is possible to reduce the cost by using a splice sleeve joint only in a portion where the stress is large and using a joint provided with a reinforcement 66 in other portions.

As shown in FIG. 20 and FIG. 21, the horizontal joining is performed by using a horizontal reinforcing bar 62 at the recess 52c.
Are piled up and fixed by cast concrete. In this case, it is possible to enhance the concrete restraining effect by using a spiral bar as the horizontal reinforcing bar 62. Also, until the concrete is cast, as shown in FIG. 21, the half precast form panel 52 using the separator 68 is used.
Is preferably temporarily fixed so that the whole effect is maintained by the box effect.

Further, full precast concrete 5
As shown in FIG. 22, a horizontal reinforcing bar 62 is inserted into the concrete hole 50a of the full precast concrete 50, and the non-shrink mortar 7 is joined to the outer frame and the inner frame.
This is performed by fixing the value to zero.

After the outer frame 54 and the inner frame 56 for one lift are constructed by the above-described method, the intermediate portion 11
The separator is installed and concrete is cast in the same manner as in the construction of b.

Hereinafter, the same steps are repeated as necessary. Next, a method of building the cross beam portion 12 will be described. [2] Construction of cross beam section 12 After the main tower section 11 has been constructed by the above steps,
Alternatively, simultaneously with the construction of the main tower 11, the construction of the cross beams 12 is performed. The cross beam portion 12 is constructed by forming a formwork by, for example, a precast assembled in an arch trust shape, assembling a reinforcing bar, and then pouring secondary concrete.

By adopting such a method, it becomes possible to build the cross beam portion 12 without a scaffold. Through the above steps, the concrete main tower 10 as shown in FIGS. 1 and 2 is constructed.

When a concrete main tower having a height of 200 m is to be constructed by the method for constructing a concrete main tower according to the present invention, for example, a base portion 11a up to 11 m above the ground and an intermediate portion 11b from 11 m to 61 m above the ground. , 61m above the ground
To 200 m can be the top 11c.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified. For example, in the above-described embodiment, the outer frame and the inner frame are formed using the panel lifting winch 31 provided on the hydraulic lifting platform 20, but the present invention is not limited to this. Instead, for example, as shown in FIG. 23, it is also possible to form an outer frame and an inner frame with a precast concrete panel 91 using a tower crane 90.

[0042]

According to the present invention configured as described above,
The effect is that it is possible to efficiently construct a concrete main tower having an excellent appearance.

[Brief description of the drawings]

FIG. 1 is a front view showing a concrete main tower constructed by a method for constructing a concrete main tower according to the present invention.

FIG. 2 is a side view showing a concrete main tower constructed by the method for constructing a concrete main tower according to the present invention.

FIG. 3 is a diagram for explaining an outline of a method for building a concrete main tower according to the present invention.

FIG. 4 is a plan view showing an outer frame and an inner frame of an intermediate portion.

FIG. 5 is a front view for explaining a method of assembling an outer frame body and an inner frame body in an intermediate portion by using a precast frame panel.

FIG. 6 is a front view showing a precast form panel.

FIG. 7 is a side view showing a precast form panel.

FIG. 8 is a diagram for explaining a method of joining the precast form panels in the vertical direction.

FIG. 9 is a view for explaining a method of joining the precast form panels in the horizontal direction.

FIG. 10 is an enlarged front view for explaining a method of assembling an outer frame body and an inner frame body at an intermediate portion using a precast form panel.

FIG. 11 is a cross-sectional view illustrating a spacer.

FIG. 12 is a plan view showing an outer frame and an inner frame at the top.

FIG. 13 is a front view for explaining a method of assembling the outer frame body and the inner frame body at the top with the half precast form panel.

FIG. 14 is a cross-sectional view showing a half precast form panel.

FIG. 15 is a longitudinal sectional view showing a half precast form panel.

FIG. 16 is a cross-sectional view for explaining the joining of the half precast form panel in the vertical direction.

FIG. 17 is a cross-sectional view showing a state in which the half precast form panels are joined in the vertical direction.

FIG. 18 is a cross-sectional view for explaining another joining of the half precast form panel in the vertical direction.

FIG. 19 is a sectional view showing a state in which the half precast form panels are joined in a vertical direction by another method.

FIG. 20 is a cross-sectional view for explaining the joining of the half precast form panels in the horizontal direction.

FIG. 21 is a perspective view for explaining the joining of the half precast form panels in the horizontal direction.

FIG. 22 is a cross-sectional view for explaining a joining state of the full precast concrete, the outer frame, and the inner frame.

FIG. 23 is a perspective view for explaining another example of the method for building a concrete main tower according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Concrete main tower 11 ... Main tower part 11a ... Foundation part 11b ... Middle part 11c ... Top part 12 ... Cross beam part 22 ... Outer frame body 24 ... Inside Frame 26 ... Concrete 32 ... Precast form panel 36 ... Steel panel 52 ... Half flexible cast form panel 54 ... Outer frame 56 ... Inner frame 60 ... Vertical Reinforcing bar 62 ・ ・ ・ Horizontal iron

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E01D 21/00 E01D 19/02

Claims (1)

(57) [Claims] 1. A step of casting concrete in a mold to build a foundation, forming a mold with a precast concrete panel above the foundation, and arranging a reinforcing bar in the mold. A step of casting concrete to build an intermediate portion, and forming a formwork with a precast concrete panel in which a reinforcing bar is buried above the intermediate portion, and casting concrete in the formwork to build a top portion. And a step of constructing a concrete main tower.